#ifndef __USART2_H
#define __USART2_H
#include "stdio.h"	
#include "stm32f4xx_conf.h"
#include "sys.h" 
#define USART2_REC_LEN  			200  	//????????? 200
extern u8  USART2_RX_BUF[USART2_REC_LEN]; //????,??USART_REC_LEN???,???????
extern u16 USART2_RX_STA; 
void uart2_init(u32 bound);











#endif






